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Financing Arrangements (Details) - USD ($)
Jan. 27, 2025
Mar. 31, 2025
Mar. 31, 2024
Financing Arrangements      
Borrowing outstanding   $ 0 $ 0
Senior Unsecured Revolving Credit Facility | Line of credit      
Financing Arrangements      
Option to increase credit facility, additional amount $ 250,000,000    
Senior Unsecured Revolving Credit Facility | Line of credit | Minimum      
Financing Arrangements      
Basis spread on variable rate 0.00%    
Senior Unsecured Revolving Credit Facility | Line of credit | Maximum      
Financing Arrangements      
Basis spread on variable rate 1.50%    
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility | Line of credit      
Financing Arrangements      
Maximum borrowing capacity $ 750,000,000    
Letter of Credit | Senior Unsecured Revolving Credit Facility | Line of credit      
Financing Arrangements      
Maximum borrowing capacity $ 100,000,000    
Line of credit      
Financing Arrangements      
Maximum borrowing capacity   172,200,000 172,500,000
Letters of credit outstanding   $ 12,100,000 $ 14,300,000